Year	Percent
1950	9.18137
1955	11.03324
1960	9.65792
1965	9.35864
1970	9.39933
1975	8.79564
1980	7.44794
1985	6.12183
1990	5.93859
1995	6.16719
2000	6.25923
2005	6.03926
2010	6.02184
2015	5.52629
2020	5.20254
2025	5.22205
2030	5.26342
2035	5.23188
2040	5.1441
2045	5.02333
2050	4.93
2055	4.93253
2060	5.00594
2065	5.04584
2070	5.02199
2075	4.94762
2080	4.8763
2085	4.8469
2090	4.85782
2095	4.86861
2100	4.85375